Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation

doi:10.1088/1674-1056/adcdf0

中国物理B ›› 2025, Vol. 34 ›› Issue (7): 70702-070702.doi: 10.1088/1674-1056/adcdf0

Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation

Hao Dong(董浩)^1,2, Daxing Huang(黄大兴)^1,2,3,†, Hao Yu(于昊)^1,2, Hongwei Gu(古宏伟)^1,2,3,‡, and Fazhu Ding(丁发柱)^1,2,3,§

1 Key Laboratory of Applied Superconductivity and Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Shandong Key Laboratory of Advanced Electromagnetic Conversion Technology and Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology, Qilu Zhongke, Jinan 250100, China

收稿日期:2025-02-23 修回日期:2025-04-11 接受日期:2025-04-17 出版日期:2025-06-18 发布日期:2025-07-03
通讯作者: Daxing Huang, Hongwei Gu, Fazhu Ding E-mail:huangdaxing@mail.iee.ac.cn;guhw@mail.iee.ac.cn;dingfazhu@mail.iee.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2022YFE03150203), the National Natural Science Foundation of China (Grant Nos. U2032217, 52072366, and 52477031), and Shandong Provincial Natural Science Foundation (Grant No. ZR2024ME217).

Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation

Hao Dong(董浩)^1,2, Daxing Huang(黄大兴)^1,2,3,†, Hao Yu(于昊)^1,2, Hongwei Gu(古宏伟)^1,2,3,‡, and Fazhu Ding(丁发柱)^1,2,3,§

1 Key Laboratory of Applied Superconductivity and Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Shandong Key Laboratory of Advanced Electromagnetic Conversion Technology and Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology, Qilu Zhongke, Jinan 250100, China

Received:2025-02-23 Revised:2025-04-11 Accepted:2025-04-17 Online:2025-06-18 Published:2025-07-03
Contact: Daxing Huang, Hongwei Gu, Fazhu Ding E-mail:huangdaxing@mail.iee.ac.cn;guhw@mail.iee.ac.cn;dingfazhu@mail.iee.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2022YFE03150203), the National Natural Science Foundation of China (Grant Nos. U2032217, 52072366, and 52477031), and Shandong Provincial Natural Science Foundation (Grant No. ZR2024ME217).

摘要/Abstract

摘要： Second-generation high-temperature superconducting (2G-HTS) magnets operating in persistent current mode (PCM) hold great promise for applications such as magnetic resonance imaging. The development of joint-less closed-loop magnets has effectively tackled the challenges of fabricating joints for REBCO tape. However, certain closed-loop magnets cannot utilize conventional persistent current switches (PCS) and instead require multi-pulse magnetization techniques. This study explores the effects of multi-pulse magnetic field excitation on the flux trapping behavior of a four-pancake coil (FPC). A detailed comparison of the effects of different pulse types and periods on the FPC reveals that the background magnetic field exceeds the critical magnetic field of the coil, thereby creating resistance in the superconducting loop. The critical magnetic field of the FPC is determined experimentally, and a reasonable speculation on the multi-pulse field excitation mechanism is presented.

关键词: joint-less coil, second-generation high-temperature superconducting (2G-HTS) coil, multi-pulse, excitation

Abstract: Second-generation high-temperature superconducting (2G-HTS) magnets operating in persistent current mode (PCM) hold great promise for applications such as magnetic resonance imaging. The development of joint-less closed-loop magnets has effectively tackled the challenges of fabricating joints for REBCO tape. However, certain closed-loop magnets cannot utilize conventional persistent current switches (PCS) and instead require multi-pulse magnetization techniques. This study explores the effects of multi-pulse magnetic field excitation on the flux trapping behavior of a four-pancake coil (FPC). A detailed comparison of the effects of different pulse types and periods on the FPC reveals that the background magnetic field exceeds the critical magnetic field of the coil, thereby creating resistance in the superconducting loop. The critical magnetic field of the FPC is determined experimentally, and a reasonable speculation on the multi-pulse field excitation mechanism is presented.

Key words: joint-less coil, second-generation high-temperature superconducting (2G-HTS) coil, multi-pulse, excitation

中图分类号: (Generation of magnetic fields; magnets)

07.55.Db

74.72.-h (Cuprate superconductors) 84.71.Ba (Superconducting magnets; magnetic levitation devices) 84.71.Mn (Superconducting wires, fibers, and tapes)

Hao Dong(董浩), Daxing Huang(黄大兴), Hao Yu(于昊), Hongwei Gu(古宏伟), and Fazhu Ding(丁发柱). Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation[J]. 中国物理B, 2025, 34(7): 70702-070702.

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Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation

Flux trapping behavior in a joint-less closed-loop 2G-HTS coil under multi-pulse magnetic field excitation

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